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If in an ionic crystal of the type A+ B-, equal number of cations and anions are missing from their lattice sites so that the electrical neutrality is maintained. The defect is called Schottky defect.

1. a) If in an ionic crystal of the type A+ B-, equal number of cations and anions are missing from their lattice sites.
2. b) The electrical neutrality is maintained.
3. c) The defect is called Schottky defect.
4. d) None of the above.

Correct answer: d) None of the above.

Solution

Schottky defect is when equal number of cations and anions are missing from their lattice sites, but the question states that equal number of cations and anions are missing.

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